Western Sydney father's diagnosis desperation

In three short months, a Western Sydney father has gone from working as a personal trainer to being paralysed from the waist down and nobody can tell him why.

Doctors are unable to diagnose the condition - leaving Richie Greer, 39, desperately searching for funding so that he can get on with life the best he can.

On January 4, Mr Greer was at home with his wife, Taylor, and four children when his life changed in an instant.

"My back jolted and I just couldn't stand. I was paralysed and I dropped to my knees," Mr Greer told A Current Affair.

"I crawled out to the lounge room and by the time I got there, I couldn't feel my legs at all."

At first, he thought it was a bulging disk or a problem relating to a previous back surgery. But it wasn't and after conducting tests for a wide range of sensory and motor dysfunction disorders, doctors are still scratching their heads.

To make matters even more difficult for the Mount Druitt family, their twin daughters have autism and developmental delays.

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Before getting sick, Mr Greer did a lot of their therapy at home with them - in an attempt to improve communication skills before they attend school - but now the tough task has been left to his wife.

"I feel helpless and like a burden to my wife, family and friends," Mr Greer said.

"My current situation won't stop me, I just need to get some support and work out how to do it, and then I will go forward. I will just find a way."

With four children and a husband who has been in hospital since January, Mrs Greer has no choice but to continue working.

"There's no option for me not to work now, more than ever I need to work, because without that money coming in, there's not a chance to pay for anything that the girls need or that Ritchie needs," Mrs Greer said.

After 10 weeks in hospital, Mr Greer is desperate to go home. The problem is, his home is not wheelchair-accessible.

"I need to get $50,000-plus, at least, just to get everything I need and I have to sponge off my family and friends," Mr Greer said.

"At the moment, we have to find it ourself. It's been no funding allocated and it's pretty much because I'm not diagnosed with anything."

But even in the most crushing of circumstances, it wasn't the Greer's who approached A Current Affair for help. It was Mrs Greer's boss, Paul.

"Any help would make a difference and any help would be greatly appreciated as well," Paul told A Current Affair.

Rather than seeking donations from the public, the Greer family have provided a list of things they need to make Richie's transition back home easier. The list of items needed can be found on the A Current Affair website.